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Run: 2026-04-24-01KQ0NEZQ64VHM8S3BSMWBXB9B
Run Details
Model:
GPT-5.5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
15.1s
Cost:
$0.029335
Provider:
OpenAI
Evaluation summary
Score
Evaluator
Details Link
100.00%
Matches word count
(details)
Model input
User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 20 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
Rain worried the windows of Blackthorn Manor while Inspector Vale studied the grandfather clock stopped at midnight precisely again tonight. Beneath its brass pendulum lay Lord Harrow, one gloved hand clutching a white rook from the chessboard beside him silently. The guests gathered in the library doorway, their faces pale masks reflected by lightning in the polished floor nearby tonight. No one spoke until Miss Elspeth, the dead man's niece, noticed blood darkening the cuff of the butler, Mr. Crane. Crane lifted his hands slowly, revealing clean palms, yet his silver serving knife had vanished from dinner without explanation entirely. Inspector Vale asked everyone to remain inside, because the storm had swallowed the bridge and telephone lines before dawn completely. From the hearth came a sudden crackle, and a sealed envelope curled black at the edges among the orange embers. On its face, in Harrow's unmistakable script, four words survived the flames: Trust none of them, not even me tonight.
created_at
"2026-04-24T21:13:50.063Z"
4/24/2026, 9:13:50 PM
model
"openai/gpt-5.5-20260423"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
13421
moderation_latency
(null)
generation_time
14872
tokens_prompt
46
tokens_completion
375
native_tokens_prompt
41
native_tokens_completion
971
native_tokens_completion_images
0
native_tokens_reasoning
758
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
(null)
num_media_completion
0
num_search_results
(null)
num_fetches
(null)
web_search_engine
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"completed"
usage
0.029335
router
(null)
provider_responses
0
endpoint_id
"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id
"resp_0b31c43cc4967cc60169ebdd0ee9288197b4573a80281c9343"
is_byok
false
latency
1040
model_permaslug
"openai/gpt-5.5-20260423"
provider_name
"OpenAI"
status
200
user_agent
"langchainjs-openai/1.0.0 ((node/v24.14.1; linux; x64))"
http_referer
(null)
request_id
"req-1777065230-rOtW6OPaslhMyIODXZeM"
session_id
(null)
api_type
"completions"
id
"gen-1777065230-D3aBSkqYBSBY2s8S3nxS"
upstream_id
"resp_0b31c43cc4967cc60169ebdd0ee9288197b4573a80281c9343"
total_cost
0.029335
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
response_cache_source_id
(null)
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
8
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20